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2.5-inch cemented doublet lens

Alvan Clark and Sons

circa 1900

2.5-inch lens

Alvan Clark and Sons

circa 1900

2.5-inch objective lens in oblique tube

Alvan Clark and Sons

circa 1875

5.25-inch astrograph lens

Alvan Clark and Sons

1910-1950

6.5-inch objective lens of Roe telescope

Alvan Clark and Sons

1897

Image Not Available

7.5-inch objective lens of Agassiz's telescope

Alvan Clark and Sons

1900

7.75-inch flint glass lens element for telescope objective

Alvan Clark and Sons

1880-1910

8-inch crown-glass element for rear doublet of f/16.5 Boyden telescope

Alvan Clark and Sons

1887

8-inch crown-glass element for telescope objective

Alvan Clark and Sons

1870-1900

8-inch element for telescope objective

Alvan Clark and Sons

1880-1890

8-inch flint-glass element for rear doublet for f/16.5 Boyden telescope

Alvan Clark and Sons

1887

8-inch rear doublet for f/16.5 Boyden photographic telescope

Alvan Clark and Sons

1887

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My Object Lists

2.5-inch cemented doublet lens

2.5-inch lens

2.5-inch objective lens in oblique tube

5.25-inch astrograph lens

6.5-inch objective lens of Roe telescope

7.5-inch objective lens of Agassiz's telescope

7.75-inch flint glass lens element for telescope objective

8-inch crown-glass element for rear doublet of f/16.5 Boyden telescope

8-inch crown-glass element for telescope objective

8-inch element for telescope objective

8-inch flint-glass element for rear doublet for f/16.5 Boyden telescope

8-inch rear doublet for f/16.5 Boyden photographic telescope